Unicode file path issue

[kokbira]

QCAD uses dxflib to open DXF files on Windows, but it has some issues with special characters on file name or path (spaces, international characters, symbols...; "À", "õ", "ß", "ç", "+" etc.), according to QCAD Bugtracker links below.

QCAD group already made a fix for that issue (qcad/qcad@6d3f688), but it would be made also on dxflib development side.

I think that StackOverflow answers would help to solve that issue:

https://stackoverflow.com/questions/396567/is-there-a-standard-way-to-do-an-fopen-with-a-unicode-string-file-path

https://stackoverflow.com/questions/402283/stdwstring-vs-stdstring

It is like doing a #ifndef to detect with SO is running on compiler to choose if it will use fopen or _wfopen and string or wstring.

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QCAD Bugtracker links:

• https://www.qcad.org/bugtracker/index.php?do=details&task_id=1180 (feb/2015)
• https://www.qcad.org/bugtracker/index.php?do=details&task_id=1251 (aug/2015)
• https://www.qcad.org/bugtracker/index.php?do=details&task_id=1357 (jan/2016)
• https://www.qcad.org/bugtracker/index.php?do=details&task_id=1771 (jun/2018)